Bought Lindy 2-port USB keyboard & mouse KVM switch last month and it worked great for a few days.
Then, switch light started blinking, mouse and keyboard stopped working on both PCs and got Windows message on my PC screen: "USB device not recognised, mulfancioning"... etc, and instead of switch's taskbar icon with number 1 I got icon for "no live connection". Both mouse and keyboard still had power when that happened, but were not responding.
If I pull out KVM switch USB connection from PC's USB port and plug it back again (both keyboard and mouse), nothing happens (apart from getting black screen on my monitor), but if I unplug switch from PC, (and switch light stop blinking and lose power) restart PC and plug it back back in, KVM works again

This happened 6 times so far for last three weeks. Every 2-3 days I have to do the same-unplug the switch, restart PC and plug it back in.

PC keyboard and mouse are USB, original HP. One PC is HP, other DELL, both run on Windows 7 operating systems SP1.
Don't have any issues with them, both have regular Windows updates, keyboard and mouse are also good, almost new.
I also reinstalled KVM switch software fef times on both PCs but nothing changed, problem remains the same.